A crane clamp deviation correction system

Abstract

The utility model discloses a crane clamp deviation correction system, wherein a lifting seat is suspended on a crane, a rotating seat is provided below the lifting seat, a rotating shaft is provided inside the rotating seat, a hook head is connected below the rotating shaft, a rotating drive mechanism for driving the rotating shaft to rotate is provided inside the rotating seat, a rotary encoder is fixed on the rotating seat through a fixed plate, a portion of the rotating seat extending above the rotating shaft contacts the detection end of the rotary encoder, and the rotary encoder outputs an induction signal to a controller in the crane. After repeated tests, the utility model adds an encoder to the hook head to measure the rotation offset angle; the measurement data determines whether the clamp angle is offset, thereby accurately obtaining information on whether there is an offset, as well as specific offset parameters, so as to facilitate the use of automated equipment or manual parameters for adjustment and correction, avoid the hook head angle offset phenomenon, and prevent the clamp from damaging the steel coil.

Description

Technical Field

[0001] The utility model relates to the technical field of deviation correction of driving clamps. Background Art

[0002] The main purpose of crane clamp correction is to correct the deviation. Long-term operation of the clamp will cause an angle difference between the clamp and the hook head, resulting in the deviation of the hook head. At present, the correction of crane clamps mainly requires manual correction.

[0003] Manual tools are generally required for correction. For example, the public document with publication number CN202715625U, publication date 2013-02-06, and patent name "A Thin Strip Steel Correction Tool" discloses a thin strip steel correction tool, which belongs to the field of cold-rolled plate and strip rolling technology, including two clamps, two pins, two chain plates, a support frame, an elastic component, two locating pins, a horizontal axis, two rivets and a handle; wherein the two clamps are fixedly connected to the two chain plates through two pins, the two chain plates are fixedly connected to the support frame, the two rivets are respectively embedded in the two clamps, the horizontal axis is sleeved on the handle, the handle is fixedly connected to the support frame, and the support frame is connected to the locating pin through the elastic component.

[0004] Correction methods such as manual use of tools affect work efficiency. The correction operation requires corresponding work experience to be completed accurately and reliably, which will invisibly increase labor costs and make it difficult to ensure that the correction operation is completely accurate and reliable. Summary of the invention

[0005] The technical problem to be solved by the utility model is to realize an automatic driving clamp deviation correction system, reduce the deviation correction difficulty and improve the deviation correction accuracy.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a crane clamp correction system, a lifting seat is suspended on the crane, a rotating seat is provided below the lifting seat, a rotating seat is provided inside the rotating seat, a rotating shaft is connected below the rotating shaft, a rotating drive mechanism for driving the rotating shaft to rotate is provided inside the rotating seat, a rotary encoder is fixed on the rotating seat through a fixing plate, the part of the rotating shaft extending out of the rotating seat contacts the detection end of the rotary encoder, and the rotary encoder outputs an induction signal to a controller in the crane.

[0007] The rotating seat is provided with a rotation limiting mechanism, which is an electric telescopic structure. When the rotation limiting mechanism is in an extended state, the end of the rotation limiting mechanism is in close contact with the rotating shaft to lock the rotating shaft to prevent rotation.

[0008] The PLC controller is connected to the rotation drive mechanism and the rotation limit mechanism via two independent frequency converters, and the frequency converter adopts CI MR-VB4A0007BBA.

[0009] A PLC controller is provided in the cab of the driving vehicle, and the PLC controller is connected to and outputs a driving signal to a rotating driving mechanism. A switch and a wireless transmitter are provided on the rotating seat, and the rotary encoder is connected to the switch via a signal line. The switch sends the collected signal via the wireless transmitter to an AP panel in the cab via a wireless network, and the AP panel sends the collected signal to the PLC controller.

[0010] The PLC controller is provided with an automatic control module and a manual control module for controlling the operation of the rotary drive mechanism, the cab is provided with a display screen for displaying parameters collected by the rotary encoder, and the cab is provided with an operating mechanism connected to the PLC controller.

[0011] The rotary encoder adopts a Kubler 58x8 multi-turn absolute value sensor, the detection end of the rotary encoder is fixedly connected to the top of the rotating shaft, the rotating shaft is coaxially connected to the rotary encoder, and the communication mode of the wireless network is prof inet.

[0012] The PLC model in the PLC controller is S7-1200, and the controller adopts CPU1214 DC / DC / R IY.

[0013] After repeated tests, the utility model adds an encoder to the hook head to measure the rotation offset angle; the measurement data determines whether the clamp angle is offset, so as to accurately obtain information on whether there is an offset and the specific parameters of the offset, so as to facilitate the use of automated equipment or manual parameters to adjust and correct the offset, avoid the hook head angle offset phenomenon, and prevent the clamp from damaging the steel coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following is a brief description of the contents expressed in each figure in the utility model specification and the marks in the figure:

[0015] Figure 1 It is a schematic diagram of the structure of the crane clamp;

[0016] The marks in the above figures are: 1. lifting seat; 2. rotating shaft; 3. rotating drive mechanism; 4. hook head; 5. fixing plate; 6. rotating encoder; 7. rotating limit mechanism. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the specific implementation methods of the present invention, such as the shapes and structures of the components involved, the relative positions and connection relationships between the components, the functions and working principles of the components, the manufacturing process and the operation and use methods, etc., through the description of the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0018] The deviation correction of the crane clamp is mainly to correct the deviation. The long-term operation of the clamp will cause an angle difference between the clamp and the hook head 4, causing the angle of the hook head 4 to deviate. Manual correction is required frequently. This affects the working efficiency. To solve the above problem, after repeated experiments, an encoder is added to the hook head 4 to measure the rotation deviation angle; the measurement data determines whether the clamp angle is offset, and the control unit automatically corrects the deviation.

[0019] The crane clamp is a suspension structure fixed under the crane. The lifting seat 1 is suspended on the crane by cables. The lifting and lowering of the lifting seat 1 can be controlled by retracting and releasing the cables. A rotating seat is provided under the lifting seat 1. A rotating shaft 2 is provided inside the rotating seat. The upper end of the rotating shaft 2 extends out of the rotating seat and is fixedly connected to the hook head 4 below. A rotating drive mechanism 3 is provided inside the rotating seat to drive the rotating shaft 2 to rotate. By driving the rotating drive mechanism 3 to rotate the rotating shaft 2, the rotation direction of the hook head 4 can be controlled. The rotating drive mechanism 3 is a conventional rotating motor for the hook head 4. In order to accurately control the position of the rotating shaft 2 and avoid the angle deviation of the hook head 4 due to multiple operations, a rotary encoder 6 is fixed on the rotating seat through a fixed plate 5. The part of the rotating shaft 2 extending out of the rotating seat contacts the detection end of the rotary encoder 6. The rotation angle of the rotating shaft 2 is obtained through the rotary encoder 6, which can be used as a correction parameter for automatic control or as a reference for manual adjustment.

[0020] The rotary encoder 6 adopts the brand Kubler 58x8 multi-turn absolute value sensor, which can remember the number of pulse turns and maintain data after the clamp is powered on after power is turned off. The detection end of the rotary encoder 6 is fixedly connected to the top of the rotating shaft 2, and the rotating shaft 2 is coaxially connected to the rotary encoder 6.

[0021] The PLC controller is installed in the driving cab of the crane. The PLC controller is connected and outputs the driving signal to the rotating driving mechanism 3. The clamp PLC (PLC model S7-1200) controller adopts CPU1214 DC / DC / RIY and adds a 4-port switch. The encoder signal is connected to the switch to ensure that the measurement data is true and valid. By upgrading the driving hardware and transforming the PLC program, it is ensured that the clamp can automatically or manually correct the angle deviation. And the clamp safety interlock can be added as needed: acceleration and deceleration position, stop position.

[0022] A switch and a wireless transmitter are provided on the rotating seat. The rotary encoder 6 is connected to the switch through a signal line. The switch sends the collected signal to the AP panel in the cab through the wireless network through the wireless transmitter. The AP panel sends the collected signal to the PLC controller. A wireless network client module and an omnidirectional antenna are added to the clamp end. The antenna and the client module are connected by a network feeder, and the client and the switch module of the clamp are connected by a network cable. The communication method is prof i net. Prof inet communication method is more stable than the previous ss i and 422 signals, reducing the fluctuation of angle values.

[0023] In terms of signal transmission, since the clamp is equipped with a wireless network client, the network signal of the clamp can be connected to the AP of the crane, and the two are connected by S7 to transmit all the signals of the clamp to the main PLC control system of the crane. This connection method is more stable than the previous cable connection. The cable will cause a certain degree of wear and tear every time the main hook moves, which can be avoided by using a wireless network connection.

[0024] The rotating seat is provided with a rotation limit mechanism 7, which is an electric telescopic structure, and the telescopic direction is perpendicular to the axis of the rotating shaft 2. The end of the rotation limit mechanism 7 has an anti-slip sheet, such as a rubber gasket. When the rotation limit mechanism 7 is in the extended state, the end of the rotation limit mechanism 7 is in close contact with the rotating shaft 2 to lock the rotating shaft 2 to prevent rotation. The overall effect is similar to "brake". A mechanical limit should be added to the rotation mechanism of the hook head 4 to prevent rotation of 360° and cause mechanical jamming. In the event of failure of the driving encoder, the normal operation of the system must still be guaranteed.

[0025] Two new frequency converters CI MR-VB4A0007BBA are added to the clamp control, one to control the rotation angle, that is, to control the rotation drive mechanism 3, and the other to control the opening and closing of the clamp, that is, to control the rotation limit mechanism 7. The frequency converter control can be used to optimize the rotation speed to prevent shaking during the rotation of the clamp, which affects work efficiency. If automatic control is performed, an angle calibration program and control logic, that is, an automatic control module, are added to the PLC controller. When the angle is offset, the crane switches to automatic mode and the clamp automatically returns to the initial setting value. It is also possible to achieve single-action control of rotation by giving a target value, or add a rotation angle to the work order to achieve the angle requirements for controlling lifting and lowering.

[0026] Generally speaking, the PLC controller is provided with a manual control module for controlling the operation of the rotary drive mechanism 3, a display screen is provided in the cab for displaying the parameters collected by the rotary encoder 6, and an operating mechanism connected to the PLC controller is provided in the cab. The operating mechanism is a conventional operating remote sensing and control panel, etc., which is used to input manual operation instructions. When manually operating the deviation correction, the staff can observe the parameters on the display screen and use the operating mechanism to achieve offset correction.

[0027] By using the structure of this system for transformation, the failure rate of the clamp is reduced, the reliability and safety of the clamp action are improved, the occurrence of safety accidents is avoided, and the continuous operation of production is guaranteed. The production stoppage and roll damage caused by electrical failure of the clamp are reduced, and the loss is saved by 50,000 yuan, which is a considerable benefit. After using it for a period of time, it meets the use requirements of the production site. After using it for a period of time, it meets the use requirements of the production site and greatly reduces the labor intensity of maintenance workers.

[0028] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A crane clamp correction system, wherein a lifting seat is suspended on a crane, a rotating seat is provided below the lifting seat, a rotating shaft is provided inside the rotating seat, a hook head is connected below the rotating shaft, and a rotating drive mechanism for driving the rotating shaft to rotate is provided inside the rotating seat, characterized in that: A rotary encoder is fixed on the rotating seat via a fixing plate, and a portion of the rotating seat extending above the rotating shaft contacts a detection end of the rotary encoder, and the rotary encoder outputs a sensing signal to a controller in the vehicle.

2. The driving clamp correction system according to claim 1 is characterized in that: The rotating seat is provided with a rotation limiting mechanism, which is an electric telescopic structure. When the rotation limiting mechanism is in an extended state, the end of the rotation limiting mechanism is in close contact with the rotating shaft to lock the rotating shaft to prevent rotation.

3. The driving clamp correction system according to claim 2 is characterized in that: The PLC controller is connected to the rotary drive mechanism and the rotary limit mechanism via two independent frequency converters, and the frequency converter adopts CIMR-VB4A0007BBA.

4. The driving clamp correction system according to claim 3 is characterized in that: A PLC controller is provided in the cab of the driving vehicle, and the PLC controller is connected to and outputs a driving signal to a rotating driving mechanism. A switch and a wireless transmitter are provided on the rotating seat, and the rotary encoder is connected to the switch via a signal line. The switch sends the collected signal via the wireless transmitter to an AP panel in the cab via a wireless network, and the AP panel sends the collected signal to the PLC controller.

5. The driving clamp correction system according to claim 4 is characterized in that: The PLC controller is provided with an automatic control module and a manual control module for controlling the operation of the rotary drive mechanism, the cab is provided with a display screen for displaying parameters collected by the rotary encoder, and the cab is provided with an operating mechanism connected to the PLC controller.

6. The driving clamp correction system according to claim 5 is characterized in that: The rotary encoder adopts a Kubler 58x8 multi-turn absolute value sensor, the detection end of the rotary encoder is fixedly connected to the top of the rotating shaft, the rotating shaft is coaxially connected to the rotary encoder, and the communication mode of the wireless network is profinet.

7. The driving clamp correction system according to claim 6 is characterized in that: The PLC model in the PLC controller is S7-1200, and the controller adopts CPU1214 DC / DC / RIY.

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